Sierra International 18-3395 Water Pump Kit without Housing Sierra Water Pump Kit Contains 18.0244 Water Pump Gasket, 18-0256 Bolt, 18-3071 Impeller, 18-3302 Impeller Key, 18-3333 Insert Cup, 18-3345 Wear Plate, 18-7483 O-Ring, 18-7485 O-Ring Sierra part number: 18-3395 Interchangeable with the following: Mallory 9-48603, Yamaha 61A-W0078-01-00, 61A-W0078-A1-00, 61A-W0078-00-00